EiaîANTIATE FOLIC IT AETA OF JAFAN. 35 



smooth on botli dorsal and ventral surfaces ; neural depression well 

 niai'ked, beinix sliirlitlv wider in about the anterior ^ than in the 

 following ^- of its entire length. Nephridial apertures commence 

 to appear from 18th segment, their positions being indicated by 

 small light l)rownish spots ; from 34th segment short but distinct 

 white nephridial papillae are observed, increasing in their length 

 posteriorly, at the same time the pigment spots at their base 

 beseeming dark brownish. 



The ventral surface is light-pinkish anteriorly, and light- 

 brownish posteriorly, with deep brown pigments at bases of nephri- 

 dial papillae as already noted. The dorsum brownish, with a 

 lighter coloured band along the posterior margin of every segment ; 

 in the middle of that band a dark brown spot. 



Elytra in 46 pairs occuring on segments 2, 4, 5, 7, and then 

 on alternate segments down to 23, and then again on segments 26, 

 29, 32 and 34, and after that on every third segment down to 

 segment 124. They are small, leaving a large portion of the back 

 exposed ; delicate, translucent, nearly circular ; with nearly central 

 attachment, which appears as a white round area ; quite destitute 

 of any papillae or hairs ; of a brown colour, lighter laterally and 

 deeper mesiad. 



Typical parapodium (lig. 2) long, its dorsal ramus represented 

 l)y a conical papilla with tip of superior aciculum in it. 

 There exists no trjice of dorsal bristles. The ventral ramus is 

 soiiu'wlial conical, its (Hstal end divided into pro-and post-setal 

 lobes, the fori HCl' slightly longer than the lattei'. Dorsal cirrus 

 borne on a comparai ively large ceratophore of a similar structure 

 as tentacular cirri, its ti[) extending beyond that of ventral 

 bristles. \'('iili'al ciiTus slioi't, less tlian j the length of the dorsal, 

 thick basally and slender tenninall\-, with a sli< rt ceratophore. 



